Open Stack

The libvirt hang was a threading deadlock within libvirt, whereas this is a
kernel crash.  I'd be surprised if they are the same issue.

The current theory on the kernel bugzilla is that it might be related to
bridge + netfilter.  That does tally with the observation of it happening
under a network load test.

Guilherme: I've never seen the issue personally, but I haven't run network
stress tests, I run Debian, I prefer FlatManager etc.  Is it fairly easy to
reproduce e.g. by running ab against a guest?  I suspect this will be
outside of anything we can fix in OpenStack itself though; the final
outcome will likely be e.g. "you must use a kernel with patch X."  You can
either go straight to the latest versions, or if you provide a simple
procedure I'm sure a number of the big clouds will want to try it on their
own configurations.

Justin



On Wed, Mar 28, 2012 at 9:45 AM, Vishvananda Ishaya
<vishvananda at gmail.com>wrote:

> This was discussed on the mailing list earlier I believe:
>
> http://www.mail-archive.com/openstack@lists.launchpad.net/msg08475.html
>
> The solution appears to be to upgrade to a newer libvirt.
>
> Vish
>
> On Mar 28, 2012, at 6:01 AM, Guilherme Birk wrote:
>
> No one is having this issue?
>
> ------------------------------
> From: guibirk at hotmail.com
> To: openstack at lists.launchpad.net
> Date: Fri, 23 Mar 2012 19:48:04 +0000
> Subject: [Openstack] KVM crash.
>
> I'm having problems with KVM on a single node installation. My problem is
> like these ones:
>
> https://bugzilla.kernel.org/show_bug.cgi?id=42703
> http://www.spinics.net/lists/kvm/msg67635.html
>
> The KVM normally crashes when I'm doing a load test with a large number of
> connections on the VM's.
>
> This appears to not happen using a dual node installation, with the
> nova-compute running with a dedicated machine.
>
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